Pipe-coupling.



No. 861,828. PATENTED JULY 30, 1907. J. GRINDROD & A. W. GILFILLAN.

BIBB GOUPLING. APPLIOATION FILED MAB.. B. 190B.

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` UNITED i STAT/Es PATENT ossrcs.

VPIPE-COUPLINGr.

`To all Iwhom 'it may concern.

' Be it known thatwe, JOHN GRINDROD and ADAM W. GILFILLAN, citizensl of the United States, residing at Bakersfield, in the county of Kern and Stateof California, have invented certain new and useful Improvements in Pipe-Couplings, of which the following is a speciication. v

Our invention has reference to pipe couplings; and it contemplates the provision oi a coupling in which a splice or joint is made by the adjoining ends of sections of pipe, thus avoiding dependence onthreads which are frequently imperfect, and the splice or joint may be made very tight without resort to the use of packing of any kind, without distorting and weakening the coupling by screwing thesame unduly tight, and without diminishing the bore of the conduit or oering any obstruction whatsoever in the same. v

' With the foregoing object in view, thefinvention consists in the peculiar and advantageous construction hereinafter described and particularly pointed out in the claims appended.

' In the accompanying drawing, forming part of thisA specification, the figure represents a lc'mgitudin'al section of la pipe coupling constituting the preferred embodiment of our invention. j

-Referring by letters to the drawing which shows a couplingfor use in high pressure systems 'and having but one splice or joint instead of three as in ordinaryl high-pressure couplings:

A and B are sections of pipe, exteriorly threaded in the usual manner and having their adjoining ends beveled as indicated'by aand b so as tomate and make a tight splice or joint.

C is a male coupling member, and D is a cdmple-l mentary female coupling member. l The male coupling member C ,is in the form of a sleeve, yand is provided at one end with aninterior thread-c corresponding to the r ordinary exterior thread of the pipe section A; it being i understood ofcourse that the pipe sectionA and the iuteriorly threaded part c ofthe coupling member C may be of any desired dLiJILeter.A At its opposite end, with 'reference to the interiorly threaded end c, the interior of the member C is plain, as indicated by d, 4in order to permit the threaded part of pipe section B to freely pass through it and* meet and mate with the end'oi the pipe v section A so as to form the splice or joint. On the outer side pf its inner portion the said nfember C is provided with a thread e whichhmay have the same pitch as the pipe thread or any other pitch desir'ed but is a leit hand thread for a purpose which will presently appear.

The female coupling member D isalso made in the f orm oiga sleeve suiciehtly large w receive the male mem- Specication of .Letters Patent.

Application tiled Marcil 8, 1906. Serial No. 304,964.

Patented July 30, 1907.5

ber C, and is provided at its inner end with an interior left hand thread f designed to coperate with the left hand thread e of member C in drawing the ends vol" the pipe sections together s0 as to form a tight splice or joint, and is also provided at its'outer end portion with an interior'thread g of the ordinary pipe type designed to engage thread on the pipe sectionB.

In making the coupling described, the end of pipe section A is turned into the male coupling member C and the end of pipe section B is inserted in the plain bore of said coupling member until the ends of said pipe sections are adjacent to each other; the female coupling `member D being screwed back on pipe section B to such an extent that when its left hand threadl f is screwed up on the corresponding thread e of member C it also carries said p'ipe section B yand by so doing brings the adjoining ends'of the pipe sections A and B together and expands said ends tight against the inner wall of coupling 'member Cv so as to assure the production of a tight splice or joint.

It will be gathered from the foregoing that the coupling shown-in the drawing has but one splice or joint',

vand yet is absolutely tight and does not entail the employment of packing of any kind. It will also be gathered that the splice or joint reinforced by thecoupling members is stronger than any other part of the conduit;

that dependence does not have to be placed on the corl rect fit of threads in order to assure the production of a tight splice or joint; andy` that thevcoupling does not have to be screwed so tight als to distort the same. This latter will be appreciated asan important advantage when it isremembered that in high-pressure pipe lines the couplings haveto withstand' an internal pressure of from five hundred to a thousand pounds to the square inch, and it is, therefore, not well to distort and weakenthe couplings in securing tight joints.

Havingdescribed our invention, what we claim and..

desire' to secure' by Letters Patent is:

'1. The combination ln' a pipe coupling, of a male coupling member interior-Iy threaded at one end and having n l plain bore at its opposite end and also having an exterior, left hand thread on the lutter end, exteriorly threaded pipe sections having beveled ends mated in the male coup,A ling member at -the .inner end of the plain bore thereof, and a female coupling member surrounding and having an interior' thread engaging one pipe section and also having an-interior left hand thread engaging the exterior, left hand thread of the male couplingr member. 2. The combination in n pipe coupling, of a malecoupling memberlinterorly threaded at one end and having;` a

plain bore' at its oppositeA end and also having nn exterior 'l left hund thread on the ,latter end, exteriorly, threaded pipe sections the ends ofv.which are brought together in the male coupling' member at the lnner end of the plain bore thereof, and a female coupling member surrounding and ha`ving an interior thread engaging one pip-e section and also having an interior left hand thread engaging the .exterior left hand thread of the male coupling member.

3. The combination in a pipe coupling, of exteriorly threaded pipe sections the `ends of which abut against each other, an interiorly and exteriorly threaded couplingA member lhaving at one end 'a plain bore and `surrounding the meeting ends of the pipe sections andv'engnging the exterior thread of one pipe section, and a female coupling 10 member having an interior thread engaging the exterior` coupling member.

In testimony whereof we ail-ix our signatures in presv ence of two witnesses.

thread of the other pipe section :1nd also 4having :mother interior thread engaging -tlxe exterior thread of the male 

